[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.098964] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.879158] random: sshd: uninitialized urandom read (32 bytes read) [ 23.090264] random: sshd: uninitialized urandom read (32 bytes read) [ 23.930617] random: sshd: uninitialized urandom read (32 bytes read) [ 24.084786] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 29.507534] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.598486] BUG: unable to handle kernel paging request at ffffebe000000008 [ 29.605611] PGD 0 P4D 0 [ 29.608273] Oops: 0000 [#1] SMP KASAN [ 29.612057] CPU: 1 PID: 4518 Comm: syz-executor533 Not tainted 4.18.0-rc4+ #139 [ 29.619484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.628830] RIP: 0010:kfree+0xa0/0x260 [ 29.632690] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 [ 29.651838] RSP: 0018:ffff8801acf27520 EFLAGS: 00010086 [ 29.657184] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 29.664437] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 29.671694] RBP: ffff8801acf27540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 29.678946] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 29.686207] R13: ffffffff8766d6c3 R14: ffff8801acf27690 R15: ffff8801ad0e83c0 [ 29.693459] FS: 0000000000b7d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 29.701666] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.707552] CR2: ffffebe000000008 CR3: 00000001acdc4000 CR4: 00000000001406e0 [ 29.714807] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.722752] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.730012] Call Trace: [ 29.732596] p9_client_create+0xf43/0x16c9 [ 29.736815] ? p9_client_read+0xc60/0xc60 [ 29.740962] ? find_held_lock+0x36/0x1c0 [ 29.745031] ? __lockdep_init_map+0x105/0x590 [ 29.749515] ? kasan_check_write+0x14/0x20 [ 29.753732] ? __init_rwsem+0x1cc/0x2a0 [ 29.757690] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 29.762697] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.767707] ? __kmalloc_track_caller+0x5f5/0x760 [ 29.772530] ? save_stack+0xa9/0xd0 [ 29.776140] ? save_stack+0x43/0xd0 [ 29.779745] ? kasan_kmalloc+0xc4/0xe0 [ 29.783609] ? kmem_cache_alloc_trace+0x152/0x780 [ 29.788432] ? memcpy+0x45/0x50 [ 29.791691] v9fs_session_init+0x21a/0x1a80 [ 29.795997] ? lock_downgrade+0x8f0/0x8f0 [ 29.800129] ? v9fs_show_options+0x7e0/0x7e0 [ 29.804536] ? kasan_check_read+0x11/0x20 [ 29.808664] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.813052] ? kasan_check_read+0x11/0x20 [ 29.817188] ? rcu_is_watching+0x8c/0x150 [ 29.821321] ? rcu_pm_notify+0xc0/0xc0 [ 29.825187] ? v9fs_mount+0x61/0x900 [ 29.828888] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.833890] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.838713] v9fs_mount+0x7c/0x900 [ 29.842252] mount_fs+0xae/0x328 [ 29.845611] vfs_kern_mount.part.34+0xdc/0x4e0 [ 29.850176] ? may_umount+0xb0/0xb0 [ 29.853785] ? _raw_read_unlock+0x22/0x30 [ 29.857912] ? __get_fs_type+0x97/0xc0 [ 29.861780] do_mount+0x581/0x30e0 [ 29.865301] ? copy_mount_string+0x40/0x40 [ 29.869520] ? copy_mount_options+0x5f/0x380 [ 29.873911] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.878915] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.883751] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.889269] ? _copy_from_user+0xdf/0x150 [ 29.893396] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.898912] ? copy_mount_options+0x285/0x380 [ 29.903385] ksys_mount+0x12d/0x140 [ 29.906992] __x64_sys_mount+0xbe/0x150 [ 29.910950] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.915948] do_syscall_64+0x1b9/0x820 [ 29.919811] ? syscall_slow_exit_work+0x500/0x500 [ 29.924629] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.929535] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.934446] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.939963] ? retint_user+0x18/0x18 [ 29.943669] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.948513] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.953688] RIP: 0033:0x4401d9 [ 29.956852] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 29.975978] RSP: 002b:00007ffded2238d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 29.983679] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 29.990938] RDX: 00000000200002c0 RSI: 00000000200001c0 RDI: 0000000000000000 [ 29.998197] RBP: 00000000006ca018 R08: 00000000200003c0 R09: 00000000004002c8 [ 30.005445] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401a60 [ 30.012691] R13: 0000000000401af0 R14: 0000000000000000 R15: 0000000000000000 [ 30.019944] Modules linked in: [ 30.023123] Dumping ftrace buffer: [ 30.026635] (ftrace buffer empty) [ 30.030330] CR2: ffffebe000000008 [ 30.033760] ---[ end trace 19fdaa711ffe9c5f ]--- [ 30.038502] RIP: 0010:kfree+0xa0/0x260 [ 30.042367] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 [ 30.061495] RSP: 0018:ffff8801acf27520 EFLAGS: 00010086 [ 30.066849] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.074110] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.081359] RBP: ffff8801acf27540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 30.088608] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 30.095863] R13: ffffffff8766d6c3 R14: ffff8801acf27690 R15: ffff8801ad0e83c0 [ 30.103112] FS: 0000000000b7d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.111316] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.117179] CR2: ffffebe000000008 CR3: 00000001acdc4000 CR4: 00000000001406e0 [ 30.124428] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.131672] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.138927] Kernel panic - not syncing: Fatal exception [ 30.144758] Dumping ftrace buffer: [ 30.148279] (ftrace buffer empty) [ 30.151966] Kernel Offset: disabled [ 30.155579] Rebooting in 86400 seconds..